Initial Vexta Core v0.1.0 release

src/node/coinstats.cpp

@@ -0,0 +1,182 @@
+// Copyright (c) 2010 Satoshi Nakamoto
+// Copyright (c) 2009-2020 The DigiByte Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <node/coinstats.h>
+
+#include <coins.h>
+#include <crypto/muhash.h>
+#include <hash.h>
+#include <index/coinstatsindex.h>
+#include <serialize.h>
+#include <uint256.h>
+#include <util/system.h>
+#include <validation.h>
+
+#include <map>
+
+// Database-independent metric indicating the UTXO set size
+uint64_t GetBogoSize(const CScript& script_pub_key)
+{
+    return 32 /* txid */ +
+           4 /* vout index */ +
+           4 /* height + coinbase */ +
+           8 /* amount */ +
+           2 /* scriptPubKey len */ +
+           script_pub_key.size() /* scriptPubKey */;
+}
+
+CDataStream TxOutSer(const COutPoint& outpoint, const Coin& coin) {
+    CDataStream ss(SER_DISK, PROTOCOL_VERSION);
+    ss << outpoint;
+    ss << static_cast<uint32_t>(coin.nHeight * 2 + coin.fCoinBase);
+    ss << coin.out;
+    return ss;
+}
+
+//! Warning: be very careful when changing this! assumeutxo and UTXO snapshot
+//! validation commitments are reliant on the hash constructed by this
+//! function.
+//!
+//! If the construction of this hash is changed, it will invalidate
+//! existing UTXO snapshots. This will not result in any kind of consensus
+//! failure, but it will force clients that were expecting to make use of
+//! assumeutxo to do traditional IBD instead.
+//!
+//! It is also possible, though very unlikely, that a change in this
+//! construction could cause a previously invalid (and potentially malicious)
+//! UTXO snapshot to be considered valid.
+static void ApplyHash(CHashWriter& ss, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
+{
+    for (auto it = outputs.begin(); it != outputs.end(); ++it) {
+        if (it == outputs.begin()) {
+            ss << hash;
+            ss << VARINT(it->second.nHeight * 2 + it->second.fCoinBase ? 1u : 0u);
+        }
+
+        ss << VARINT(it->first + 1);
+        ss << it->second.out.scriptPubKey;
+        ss << VARINT_MODE(it->second.out.nValue, VarIntMode::NONNEGATIVE_SIGNED);
+
+        if (it == std::prev(outputs.end())) {
+            ss << VARINT(0u);
+        }
+    }
+}
+
+static void ApplyHash(std::nullptr_t, const uint256& hash, const std::map<uint32_t, Coin>& outputs) {}
+
+static void ApplyHash(MuHash3072& muhash, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
+{
+    for (auto it = outputs.begin(); it != outputs.end(); ++it) {
+        COutPoint outpoint = COutPoint(hash, it->first);
+        Coin coin = it->second;
+        muhash.Insert(MakeUCharSpan(TxOutSer(outpoint, coin)));
+    }
+}
+
+static void ApplyStats(CCoinsStats& stats, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
+{
+    assert(!outputs.empty());
+    stats.nTransactions++;
+    for (auto it = outputs.begin(); it != outputs.end(); ++it) {
+        stats.nTransactionOutputs++;
+        stats.nTotalAmount += it->second.out.nValue;
+        stats.nBogoSize += GetBogoSize(it->second.out.scriptPubKey);
+    }
+}
+
+//! Calculate statistics about the unspent transaction output set
+template <typename T>
+static bool GetUTXOStats(CCoinsView* view, BlockManager& blockman, CCoinsStats& stats, T hash_obj, const std::function<void()>& interruption_point, const CBlockIndex* pindex)
+{
+    std::unique_ptr<CCoinsViewCursor> pcursor(view->Cursor());
+    assert(pcursor);
+
+    if (!pindex) {
+        {
+            LOCK(cs_main);
+            pindex = blockman.LookupBlockIndex(view->GetBestBlock());
+        }
+    }
+    stats.nHeight = Assert(pindex)->nHeight;
+    stats.hashBlock = pindex->GetBlockHash();
+
+    // Use CoinStatsIndex if it is requested and available and a hash_type of Muhash or None was requested
+    if ((stats.m_hash_type == CoinStatsHashType::MUHASH || stats.m_hash_type == CoinStatsHashType::NONE) && g_coin_stats_index && stats.index_requested) {
+        stats.index_used = true;
+        return g_coin_stats_index->LookUpStats(pindex, stats);
+    }
+
+    PrepareHash(hash_obj, stats);
+
+    uint256 prevkey;
+    std::map<uint32_t, Coin> outputs;
+    while (pcursor->Valid()) {
+        interruption_point();
+        COutPoint key;
+        Coin coin;
+        if (pcursor->GetKey(key) && pcursor->GetValue(coin)) {
+            if (!outputs.empty() && key.hash != prevkey) {
+                ApplyStats(stats, prevkey, outputs);
+                ApplyHash(hash_obj, prevkey, outputs);
+                outputs.clear();
+            }
+            prevkey = key.hash;
+            outputs[key.n] = std::move(coin);
+            stats.coins_count++;
+        } else {
+            return error("%s: unable to read value", __func__);
+        }
+        pcursor->Next();
+    }
+    if (!outputs.empty()) {
+        ApplyStats(stats, prevkey, outputs);
+        ApplyHash(hash_obj, prevkey, outputs);
+    }
+
+    FinalizeHash(hash_obj, stats);
+
+    stats.nDiskSize = view->EstimateSize();
+    return true;
+}
+
+bool GetUTXOStats(CCoinsView* view, BlockManager& blockman, CCoinsStats& stats, const std::function<void()>& interruption_point, const CBlockIndex* pindex)
+{
+    switch (stats.m_hash_type) {
+    case(CoinStatsHashType::HASH_SERIALIZED): {
+        CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
+        return GetUTXOStats(view, blockman, stats, ss, interruption_point, pindex);
+    }
+    case(CoinStatsHashType::MUHASH): {
+        MuHash3072 muhash;
+        return GetUTXOStats(view, blockman, stats, muhash, interruption_point, pindex);
+    }
+    case(CoinStatsHashType::NONE): {
+        return GetUTXOStats(view, blockman, stats, nullptr, interruption_point, pindex);
+    }
+    } // no default case, so the compiler can warn about missing cases
+    assert(false);
+}
+
+// The legacy hash serializes the hashBlock
+static void PrepareHash(CHashWriter& ss, const CCoinsStats& stats)
+{
+    ss << stats.hashBlock;
+}
+// MuHash does not need the prepare step
+static void PrepareHash(MuHash3072& muhash, CCoinsStats& stats) {}
+static void PrepareHash(std::nullptr_t, CCoinsStats& stats) {}
+
+static void FinalizeHash(CHashWriter& ss, CCoinsStats& stats)
+{
+    stats.hashSerialized = ss.GetHash();
+}
+static void FinalizeHash(MuHash3072& muhash, CCoinsStats& stats)
+{
+    uint256 out;
+    muhash.Finalize(out);
+    stats.hashSerialized = out;
+}
+static void FinalizeHash(std::nullptr_t, CCoinsStats& stats) {}